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Warn when "false" or "true" is the value of a boolean DOM prop #13372

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Merged
gaearon merged 4 commits into from
Aug 14, 2018
Merged

Warn when "false" or "true" is the value of a boolean DOM prop #13372

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1447508
Warn when the string "false" is the value of a boolean DOM prop
motiz88 Aug 11, 2018
b8f83cd
Only warn on exact case match for "false" in DOM boolean props
motiz88 Aug 12, 2018
f3248f2
Warn on string "true" as well as "false" in DOM boolean props
motiz88 Aug 12, 2018
f70a0eb
Clarify warnings on "true" / "false" values in DOM boolean props
motiz88 Aug 12, 2018
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Only warn on exact case match for "false" in DOM boolean props
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@motiz88
motiz88 committed Aug 12, 2018
commit b8f83cdfe4c0499c67ee07658a3e0f1b08a1afd6
12 changes: 0 additions & 12 deletions packages/react-dom/src/__tests__/ReactDOMComponent-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2518,18 +2518,6 @@ describe('ReactDOMComponent', () => {

expect(el.getAttribute('hidden')).toBe('');
});

it('warns on the ambiguous string value "False"', function() {
let el;
expect(() => {
el = ReactTestUtils.renderIntoDocument(<div hidden="False" />);
}).toWarnDev(
'Received the string `False` for the boolean attribute `hidden`. ' +
'Did you mean hidden={false}?',
);

expect(el.getAttribute('hidden')).toBe('');
});
});

describe('Hyphenated SVG elements', function() {
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5 changes: 2 additions & 3 deletions packages/react-dom/src/shared/ReactDOMUnknownPropertyHook.js
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Expand Up @@ -229,10 +229,9 @@ if (__DEV__) {

// Warn when passing the string 'false' into a boolean prop
if (
value === 'false' &&
propertyInfo !== null &&
propertyInfo.type === BOOLEAN &&
typeof value === 'string' &&
value.toLowerCase() === 'false'
propertyInfo.type === BOOLEAN
) {
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@gaearon gaearon Aug 12, 2018

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Let’s make value === 'false' the first condition. Since it’s rare we won’t have to check most other conditions.

warning(
false,
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